Making tutorial examples available

[WolfgangFahl]

There seem to be dozens of python examples in the tutorial markup files that seem to be "buried" and not available for testing / Interactive checking at this time.

Personally i like the https://nicegui.io/ approach much better where the example code and the interactive version of each example are side by side.

I just created a small script to count the examples.
if you run scripts/findexamples you'll see an estimate.

     309

shows that there seem to be some 150 such examples given that each example gives two lines of output. Instead of manually copying the example as I did with the examples/tutorial examples/tutorial/tailwind_colors.py example I'd prefer to have some kind of automation in place to improve the availability and accessiblity of examples.